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2. Acid test - Wikipedia

   en.wikipedia.org/wiki/Acid_test

   An acid test is a qualitative chemical or metallurgical assay utilizing acid. Historically, it often involved the use of a robust acid to distinguish gold from base metals . Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.

3. Touchstone (assaying tool) - Wikipedia

   en.wikipedia.org/wiki/Touchstone_(assaying_tool)

   This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.

4. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   Apart from X-ray spectrometer technique, other older traditional methods are using the TouchStone and Acid to test the gold purity. But TouchStone and Acid are destructive testing - a tiny sample of gold is cut and then tested. The sample is rubbed on TouchStone and a drop of acid is put on it and the goldsmith observes the residue using a ...

5. Metallurgical assay - Wikipedia

   en.wikipedia.org/wiki/Metallurgical_assay

   A model of a late 19th-century Canadian seal used to certify the quality of assayed gold. A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.

6. Acid test (gold) - Wikipedia

   en.wikipedia.org/?title=Acid_test_(gold)&redirect=no

   Pages for logged out editors learn more. Contributions; Talk; Acid test (gold)

7. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Gold parting - Wikipedia

   en.wikipedia.org/wiki/Gold_parting

   It is an electrolytic process using pure gold for the cathode (or titanium as a starter cathode) and chloroauric acid (gold chloride-hydrochloric acid) as the electrolyte; this is made by dissolving gold with chlorine gas in the presence of hydrochloric acid. Gold is dissolved at the anode, and pure gold, traveling through the acid by ion ...

9. France government collapses again after prime minister forced out

   www.aol.com/news/france-government-collapses...

   France's government collapsed Wednesday after Prime Minister Michel Barnier was forced out in a no-confidence vote in Parliament, reigniting a summertime political crisis for the country as it ...